CN102470467B - Thread Forming Taps - Google Patents
Thread Forming Taps Download PDFInfo
- Publication number
- CN102470467B CN102470467B CN200980160317.9A CN200980160317A CN102470467B CN 102470467 B CN102470467 B CN 102470467B CN 200980160317 A CN200980160317 A CN 200980160317A CN 102470467 B CN102470467 B CN 102470467B
- Authority
- CN
- China
- Prior art keywords
- mentioned
- angle
- protuberance
- plastic deformation
- interval
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G7/00—Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material
- B23G7/02—Tools for this purpose
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Drilling Tools (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Transmission Devices (AREA)
- Surgical Instruments (AREA)
Abstract
In the thread forming tap according to the present invention, since the margin section is substantially 0 with respect to the shape in the vicinity of the protrusion apex (δ is 0 °), the contact area with the workpiece during thread forming is reduced, and the friction torque and heat generation are reduced. In the rough plastic deformation zone that is separated from the apex of the protruding portion (δ is 0 °), the relief (R) is in the shape of an archimedean curve that changes linearly, in the finish plastic deformation zone near the apex, the protruding portion shape changes with the secondary curve, and in the vicinity of the apex where the machining load is large, the change in the relief (R) is small, so that the thread forming process proceeds smoothly, and the friction torque and heat generation are reduced without impairing the durability of the protruding portion. Since the friction torque and heat generation are reduced without impairing the durability of the protruding portion by the reduction of the margin and the special shape of the protruding portion, the occurrence of welding, the abrasion and damage of the protruding portion can be suppressed and the tool life can be improved even when tap machining is performed under conditions where welding is likely to occur, such as high-speed machining.
Description
Technical field
The present invention relates to thread forming tap, particularly, even when High-speed machining etc. easily produces under the condition of welding machining internal thread, also can access the technology of good durability.
Background technology
Known following thread forming tap, it has complete tooth portion and arranges continuously with this complete tooth portion and the forward end cutting portion of path more more, and, in these complete tooth portions and cutting portion, be provided with the external screw thread (with reference to patent documentation 1,2) that alternately forms protuberance and withdrawing portion.In such thread forming tap, by being screwed into from cutting portion side in the bottom outlet that is arranged at machined object, above-mentioned protuberance is cut into the inwall skin section of this bottom outlet and plastic deformation forms internal thread thus, therefore, does not discharge the simplifications such as smear metal, cleaning operation.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2003-127027 communique
Patent documentation 2: TOHKEMY 2004-148430 communique
Summary of the invention
The problem that invention will solve
But, at the above-mentioned protuberance of such thread forming tap, generally around tool focus line O, the angular range in 2 ° of peripheral parts～6 ° of left and right, there is the certain surplus of diameter dimension, therefore, for example, at a high speed to carry out tapping in the situation that, (for example will compare hard, more than about 30HRC) steel tapping time, produce large friction torque (rotational resistance), because heating produces welding, damage life tools significantly.
The present invention is that above situation is made as background, and its object is the heating producing while being suppressed at plastic working internal thread, prevents the welding to instrument of machined object, and by reducing hot impact, suppresses the wearing and tearing of instrument, and improved life tools.In addition, by suppressing welding, the High-speed machining of internal thread machining is changed into as possibility.
Solve the technical scheme of problem
In order to reach this object, the 1st invention is a kind of thread forming tap, it has complete tooth portion and arranges continuously with this complete tooth portion and the forward end cutting portion of path more more, and, in these complete tooth portions and cutting portion, be provided with the external screw thread that has alternately formed protuberance and withdrawing portion, it is characterized in that, (a) about the shape around tool focus line O of the above-mentioned protuberance of above-mentioned cutting portion, screw forming process side in the vertex of this protuberance from diameter dimension maximum, and incision machined object carry out in the machining area of screw forming processing, above-mentioned summit is made as to 0 °, the angle towards screw forming process side around above-mentioned tool focus line O is made as to δ, now, (b) at above-mentioned angle δ, be that fine finishining plastic deformation below flex point angle θ predetermined in above-mentioned machining area is interval, as the amount of retreating of the diameter dimension on the above-mentioned summit from this angle δ=0 °, move back the amount of cutting R, be confirmed as with along with towards this flex point angle θ side the mode that increases, the shape of above-mentioned protuberance changes along with conic section with respect to angle δ, on the other hand, (c) interval in the above-mentioned angle δ thick plastic deformation larger than above-mentioned flex point angle θ, be confirmed as moving back with above-mentioned the mode that the amount of cutting R increases point-blank with respect to this angle δ, the shape of above-mentioned protuberance changes along with the archimedes curve (also referred to as Archimedes's helix) of the clearance angle α 1 in certain thick plastic deformation interval, and, (d) the surplus interval of the diameter dimension of the above-mentioned protuberance equating with the diameter dimension on above-mentioned summit is set as and is roughly 0, or above-mentioned angle δ is in 1 ° of following scope.
The 2nd invention, in the thread forming tap of the 1st invention, it is characterized in that, above-mentioned fine finishining plastic deformation is interval, if there is no above-mentioned surplus, the above-mentioned summit being in from above-mentioned angle δ=0 ° is to the scope of above-mentioned flex point angle θ, in the situation that there is above-mentioned surplus, is in from the outer end of this surplus to the scope of flex point angle θ.
The 3rd invention, in the thread forming tap of the 1st invention or the 2nd invention, it is characterized in that, (a) above-mentioned flex point angle θ is defined in 0 ° of < θ≤4 °, and when there is above-mentioned surplus, in the scope in the outside of this surplus, (b) the clearance angle α 1 in above-mentioned thick plastic deformation interval is defined in the scope of 1≤12 ° of 2 °≤α, (c) interval in above-mentioned fine finishining plastic deformation, along with towards above-mentioned flex point angle θ, it is large that clearance angle α becomes gradually, near this flex point angle θ, become the clearance angle α 1 in above-mentioned thick plastic deformation interval, be connected smoothly with above-mentioned thick plastic deformation interval.
The 4th invention, in any thread forming tap in the 1st invention the～the 3 invention, it is characterized in that, clip the shape of the withdrawing side contrary with above-mentioned screw forming process side on the above-mentioned summit of above-mentioned angle δ=0 °, change relatively symmetrically with this screw forming process side.
The 5th invention, in any thread forming tap in the 1st invention the～the 4 invention, it is characterized in that, the shape with the above-mentioned protuberance in the interval and above-mentioned thick plastic deformation interval of above-mentioned fine finishining plastic deformation is, the shape at the above-mentioned externally threaded side of this protuberance and the position of the either one or both in crest.
Invention effect
In such thread forming tap, shape about the summit from protuberance in screw forming process side, surplus interval is roughly 0, or angle δ is in 1 ° of following narrow scope, therefore, the contact area with machined object during screw forming processing (rolling and processing) diminishes, and reduces friction torque (rotational resistance), heating.In addition, there is the interval and thick plastic deformation of fine finishining plastic deformation interval, the thick plastic deformation of having left in the summit from protuberance (δ=0 °) is interval, with respect to angle δ, move back the archimedes curve shape that the amount of cutting R changes for the mode with straight line, and it is interval in subapical fine finishining plastic deformation, the shape of protuberance forms along with conic section changes with respect to angle δ, near machining load great summit, the variation of moving back the amount of cutting R diminishes, therefore screw forming processing is successfully carried out, the durability of not damaging protuberance is (anti-wear, damage etc.) reduce friction torque, heating.
Like this, according to thread forming tap of the present invention, by dwindling and the special shape of protuberance of surplus interval, do not damage protuberance durability (anti-wear, damage etc.) reduce friction torque, heating, therefore, even when High-speed machining, low lubricating oils etc. easily produce under the condition of welding screw forming machining internal thread, also suppress the generation of welding, the wearing and tearing of protuberance, damage and improve life tools.In addition, be not limited to the low-carbon steel that ductility is good, the materials such as the harder high carbon steel of thread forming tap processing difficulties, steel alloy (more than 30HRC left and right) also can be suitable for.
In the 3rd invention, flex point angle θ is 0 ° of < θ≤4 ° and while there is surplus, be defined in the scope in outside of this surplus, the clearance angle α 1 in thick plastic deformation interval is defined in the scope of 1≤12 ° of 2 °≤α, on the other hand, interval in fine finishining plastic deformation, along with towards flex point angle θ, it is large that clearance angle α becomes gradually, near this flex point angle θ, clearance angle α 1 ground that becomes thick plastic deformation interval is connected smoothly with thick plastic deformation interval, therefore, further successfully carry out screw forming processing, the durability that can not damage protuberance is (anti-wear, damage etc.) suitably reduce friction torque, heating.
In the 4th invention, protuberance clips summit and forms symmetric shape, therefore, as a whole, surplus interval is below 2 °, diminish with the contact area of machined object, suitably reduce friction torque, heating, and, compare with the situation of setting separately the shape of withdrawing side with respect to process side, design easily, simply and at an easy rate forms.
Accompanying drawing explanation
Fig. 1 is that explanation is as the figure of the thread forming tap of one embodiment of the invention, Fig. 1 (a) is front view, Fig. 1 (b) is the enlarged drawing of the IB-IB section of Fig. 1 (a), and Fig. 1 (c) is further presentation graphs 1(b enlargedly) the summit of protuberance near figure.
Fig. 2 be using angle δ as parameter and (レ リ ー Off is cut near the moving back summit of the protuberance of the embodiment of presentation graphs 1) amount R figure.
Fig. 3 is near the figure of the setting order of the shape summit of protuberance of embodiment of key diagram 1.
Fig. 4 be illustrate respectively use each 2 products of the present invention, comparative product and in the past product carried out the figure of the result of endurancing, Fig. 4 (a) means the figure that the shape of protuberance is compared, and Fig. 4 (b) means until the figure that the processing hole count of life tools compares.
Fig. 5 be illustrate respectively use each 2 products of the present invention, comparative product and in the past product carried out the figure of the result of endurancing, Fig. 5 (a) means until the figure that the processing hole count of life tools compares, and Fig. 5 (b) means product of the present invention and the measurement result of the tapping moment of torsion of product compares figure in the past.
The explanation of Reference numeral
10: thread forming tap 16: external screw thread 18: protuberance 20: withdrawing portion 22: complete tooth portion 24: cutting portion O: tool focus line δ: from the angle θ on protuberance summit: flex point angle [alpha] 1: the clearance angle in thick plastic deformation interval
The specific embodiment
Thread forming tap of the present invention is used as follows, that is, be screwed in the bottom outlet that is arranged at machined object from cutting portion side, and accordingly, the inwall skin section that is cut into this bottom outlet by above-mentioned protuberance produces plastic deformation, thereby forms internal thread.Also the drill bit for machined bottom, reamer etc. can be arranged on integratedly to the front of screw tap, also can be provided for integratedly the internal diameter fine finishining sword etc. of the internal diameter of fine finishining internal thread, can have various modes.
Thread forming tap, expectation is in the continuous mode in a plurality of protuberances and axis parallel ground, more than axle center equally spaced arranges 3 row, but also the protuberance of each row can be arranged in the continuous mode of helically of reversing around axle center, also can be around axle center with unequal interval arrange etc., can have various modes.As required, also can oil groove etc. that supply with machining fluid be axially set to cut apart externally threaded mode.
Therefore thread forming tap does not produce smear metal, to blind hole (Zhiり cave), can both carry out well tapping to through hole, forms internal thread.According to the present invention, even when High-speed machining, low lubricity finish (water-soluble lubricating finish etc.) etc. easily produce under the condition of welding screw forming machining internal thread, do not damage yet protuberance durability reduce friction torque, heating and suppress welding, improve life tools, can certainly carry out screw forming processing with low speed, or use not water-soluble etc. the higher lubricating oils of greasy property, carry out screw forming processing.
The surplus interval of the diameter dimension of the protuberance that expectation equates the diameter dimension on the summit with protuberance is made as 0, from angle δ=0 °, becomes conic section shape, but also can have surplus in angle δ is the scope below 1 °.Expectation surplus is little.In addition, externally threaded protuberance shape like this can form by following mode,, by being ground by controls such as cams, cut for example externally threaded distance of grinding between skiving stone and screw tap material of processing, but the invention relates to externally threaded protuberance shape, its manufacture method is not limited especially, even to grind manufacturing technology beyond skiving stone while forming the external screw thread of thread forming tap, the present invention also can be suitable for.
The amount of the cutting R that moves back in the fine finishining plastic deformation interval that the shape of protuberance changes along with conic section with respect to angle δ is determined as follows: for example, in angle δ=0 °, or in the outer end in surplus interval, to move back the amount of cutting R be minimum (=0), along with angle δ increases, in the mode of quadratic function, increase.Be desirably in such conic section, in addition, clearance angle α becomes greatly continuously, becomes the clearance angle roughly the same with the clearance angle α 1 in thick plastic deformation interval set at flex point angle θ.That is, for example, be desirably between 0.1 °～α 1, the mode changing continuously with clearance angle α is set the conic section of protuberance.The shape of protuberance is changed along with conic section, or the shape of protuberance is changed along with archimedes curve, might not be tight geometric conic section, archimedes curve, also can cut mismachining tolerance of adding man-hour etc. and have a little error because grinding grinding of skiving stone.In other words, by the target shape that approaches definite protuberance such as clastotype of grinding skiving stone so long as conic section, archimedes curve.
According to the shape of the definite protuberance of conic section, archimedes curve, by changing with its diameter dimension the cam that (moving back the variation of the amount of cutting R) makes accordingly, can make to grind skiving stone and mechanically with respect to screw tap material, relatively approach discretely and form, also can control etc. and to approach separation with the signal of telecommunication by NC.Externally threaded processing, the general groove that carries out respectively slot part grinds the periphery of cutting processing and crest and grinds and cut processing, protuberance shape of the present invention, although be only applicable to grind and cut the side being processed to form and grind the either party who cuts in the crest being processed to form by periphery by groove, expect that protuberance shape of the present invention is applicable to this two side.Particularly, expectation incision machined object and significantly to the outer peripheral edges of friction torque, the relevant side that generates heat near near the shape of (crest) meet protuberance shape of the present invention.Protuberance shape can be used such as contact pin type surface roughness measurement device etc. and measure.
In the 3rd invention, further expect that flex point angle θ sets in the scope of 0 ° of < θ≤4 °, the clearance angle α 1 in thick plastic deformation interval sets in the scope of 1≤12 ° of 2 °≤α, but further expect that flex point angle θ is in the scope of ° left and right, 1 °≤θ≤3, the clearance angle α 1 in thick plastic deformation interval is in the scope of 1≤8 ° of left and right of 4 °≤α.When implementing the 1st invention, for example, also can be according to the hardness of externally threaded nominal diameter, machined object etc., surpass the clearance angle α 1 that flex point angle θ, thick plastic deformation interval are set in above-mentioned scope ground.
In the 4th invention, clip the shape of the recessed side contrary with screw forming process side on summit of the protuberance of angle δ=0 °, also form relatively symmetrically with this screw forming process side, but withdrawing side is almost irrelevant with screw forming processing, therefore consider the contact that the elasticity by machined object produces, for example, from protuberance summit (δ=0 °), surpassing flex point angle θ ground changes the shape of protuberance along with conic section, or from protuberance summit (δ=0 °) directly along with archimedes curve variation etc., can suitably set separately the shape of protuberance with screw forming process side.
The present invention at least limits the shape of the protuberance of cutting portion according to conic section and archimedes curve, about the shape of the protuberance of complete tooth portion, can suitably set separately with cutting portion.For example, can similarly according to conic section and archimedes curve, limit with cutting portion, also can be only according to conic section or only limit according to archimedes curve, also can adopt other shape.In addition, be positioned at complete tooth portion foremost and the 1st complete tooth relevant to screw forming processing belong to cutting portion.
The establishing method of the shape of the above-mentioned protuberance of any thread forming tap in the 1st invention the～the 5 invention consists of following operation, for example, (a) determine respectively the operation of clearance angle α 1 in the above-mentioned thick plastic deformation interval of moving back the amount of cutting Rc and above-mentioned thick plastic deformation interval of above-mentioned flex point angle θ, this flex point angle θ; (b), at above-mentioned flex point angle θ, with the above-mentioned amount of the cutting R that moves back, become the operation that the above-mentioned mode of moving back the amount of cutting Rc and clearance angle α and becoming the clearance angle α 1 in above-mentioned thick plastic deformation interval determines the conic section in above-mentioned fine finishining plastic deformation interval.
The clearance angle α 1 in flex point angle θ, thick plastic deformation interval, for example, consider the hardness of externally threaded nominal diameter and machined object and set.For example, when nominal diameter is large with hour compare, flex point angle θ is reduced, the clearance angle α 1 in thick plastic deformation interval is increased.In addition, when the hardness of machined object is high, compare when low, flex point angle θ is reduced, and the clearance angle α 1 in thick plastic deformation interval is increased.
Along with the archimedes curve of the clearance angle α 1 in certain thick plastic deformation interval determine shape thick plastic deformation interval move back the amount of cutting R, can use flex point angle θ move back the amount of cutting Rc and externally threaded nominal diameter for D following formula (1) represent.
R＝｛D×π×（δ－θ）/360｝×tanα1＋Rc···（1）
Thread forming tap of the present invention, consists of tool materials such as superhard alloy, high speed tool steel.In addition, also can as required, cover the compounds such as TiN, TiCN, TiAlN, CrN by overlay film, DLC(Diamond Like Carbon; Diamond-like-carbon) film, diamond, by hard such as overlay films by overlay film, maybe can be implemented steam treatment, nitrogen treatment etc.
Embodiment
Below, Yi Bian with reference to accompanying drawing, explain embodiments of the invention on one side.
Fig. 1 is that explanation is as the figure of the thread forming tap 10 of one embodiment of the invention, this thread forming tap 10 is by nominal value: the right-handed thread of M10 * 1.5, protuberance (ロ ー Block) number: 8, cutting draft angle: 10 ° of ground form, material consists of high speed tool steel, and, at surface coverage TiCN film as hard by overlay film.Fig. 1 (a) be from the being seen front view of the rectangular direction of tool focus line O, Fig. 1 (b) is the enlarged drawing of the IB-IB section of Fig. 1 (a), and Fig. 1 (c) is further presentation graphs 1(b enlargedly) protuberance 18 summit (δ=0 °) near the figure of shape.This thread forming tap 10 is for machining internal thread, is equipped with integratedly via not shown chuck and is arranged on handle 12 on main shaft and by being screwed into the processing department 14 that forms internal thread in bottom outlet on coaxial.
Fig. 1 (c) is near the enlarged drawing of the shape in the protuberance 18 summit of Fig. 1 (b).; the protuberance summit of diameter dimension maximum (protuberance top) is being made as to 0 °; when the angle around tool focus line O is made as to δ, represent to adding the screw forming process side (the clockwise direction in Fig. 1 (c)) of the direction of rotation in man-hour as screw forming and to the contrary withdrawing side figure in the scope of ° left and right, δ=± 6 respectively.In the present embodiment, using protuberance 18 summit, be angle δ=0 ° as center, process side and withdrawing side be shaped as symmetric shape.In addition, in the past, in Fig. 1 (c), shown in dotted line, the scope inner diameter size in ° left and right, angle δ=± 2 is maximum gauge, has certain surplus, and as shown by the solid line in the present embodiment surplus to be roughly 0(angle δ be below about 10 ').Fig. 1 (b) and Fig. 1 (c) are the shapes in cutting portion 24, and tooth portion 22 also has protuberance 18 and withdrawing portion 20 and similarly forms with cutting portion 24 completely.Fig. 1 (c) is the shape of the crest of ridge, and side also similarly changes around tool focus line O and crest, can regard as and the same shape of crest near the crest of side.In addition, the circular arc r representing with a little line in Fig. 1 (c) is the circular arc with protuberance 18 summit (δ=0 °) same diameter size.
Fig. 2 is the figure that further specifically describes near the shape in above-mentioned protuberance 18 summit, about from summit, (δ=0 °), to the figure of process side, means from the angle δ of summit (δ=0 °) with as the figure that moves back the relation between the amount of cutting R of the amount of retreating of the diameter dimension from summit (δ=0 °).In other words, be equivalent near launched around tool focus line O protuberance 18 summit expanded view, in above-mentioned Fig. 1 (c), at circular arc r with represent between the solid line of the present embodiment that interval is radially to move back the amount of cutting R.In Fig. 2, in fine finishining plastic deformation interval below the predetermined flex point angle θ of angle δ, with along with from summit (δ=0 °) to flex point angle θ side, move back the mode that the amount of cutting R increases in the mode of quadratic function, the shape of protuberance 18 changes along with conic section with respect to angle δ.At angle δ, surpassed in the thick plastic deformation interval of flex point angle θ, the mode increasing with respect to angle δ straight line to move back the amount of cutting R, the shape of protuberance 18 changes along with the archimedes curve of certain clearance angle α 1.Flex point angle θ in the scope of 0 ° < θ≤4 °, θ=2 ° in the present embodiment, clearance angle α 1 in the scope of 1≤12 ° of 2 °≤α, in the present embodiment, α 1=6 °.In addition, in the present embodiment, the roll extrusion of every 1 protuberance (translocation is made) amount, that is, the approach of a protuberance 18 is approximately 0.033mm, the region of moving back the amount of cutting R < 0.033 is machining area, above-mentioned flex point angle θ is set at (angle δ is approximately 3.3 ° below) in machining area, and thick plastic deformation interval is set to over machining area, for example, be set at until in the scope of ° left and right, angle δ=6.In addition, about the withdrawing portion 20 in the outside in this thick plastic deformation interval, be appropriately determin, make it such as diameter dimension formation with certain etc.
The conic section shape of the protuberance 18 in above-mentioned fine finishining plastic deformation interval is the conic section that also represents to move back the variation of the amount of cutting R in Fig. 2, be confirmed as, it is large that clearance angle α becomes gradually, near flex point angle θ, become the clearance angle α 1 in thick plastic deformation interval, via the junction surface that is arranged near the scope of regulation flex point angle θ, be connected with the straight line in thick plastic deformation interval smoothly.Be confirmed as particularly, for example, on ° summit, angle δ=0, ° left and right, clearance angle α=0.1, at the flex point angle of angle δ=θ, clearance angle α=α 1.In the present embodiment of θ=2 °, α 1=6 °, fine finishining plastic deformation interval move back the amount of cutting R, in the mode of the conic section shown in for example following formula (2), be set.In addition, the angle δ at above-mentioned junction surface is determined in for example scope below about 30 '.
R＝0.00196×δ
2＋0.00448×δ···（2）
In addition, thick plastic deformation interval move back that the amount of cutting R uses the flex point angle θ that stipulated by above-mentioned conic section move back the amount of cutting Rc, by above-mentioned (1) formula, represent.In the present embodiment, the nominal diameter D=10mm of external screw thread 16, flex point angle θ=2 °, clearance angle α 1=6 °, therefore, become following formula (3).
R＝｛10×π×（δ－2）/360｝×tan6°＋0.00196×2
2＋0.00448×2···（3）
Near shape such protuberance 18 summit, as shown in Figure 2 above, to determine with respect to the moving back being changed to benchmark of the amount of cutting R of angle δ, for example, is set according to order as shown in Figure 3.That is, first, in step S1, determine flex point angle θ.This flex point angle θ be take in the scope of 0 ° of < θ≤4 ° and entered in machining area is condition, consider for example nominal diameter D and machined object hardness be set, when nominal diameter D is large, be reduced with this flex point angle θ that hour compares, this flex point angle θ that compares when low when the hardness of machined object is high is reduced.In step S2, determine that above-mentioned flex point angle θ's moves back the amount of cutting Rc.This move back the amount of cutting Rc beguine according to the screw forming amount of every 1 tooth of having calculated such as the length of protuberance number and cutting portion 24 etc. little determined.In step S3, determine the clearance angle α 1 in thick plastic deformation interval, that is, and the gradient of moving back the amount of cutting R of Fig. 2.This clearance angle α 1 take that to enter in the scope of 1≤12 ° of 2 °≤α be condition, consider that for example the hardness of nominal diameter D and machined object is set, when nominal diameter D is large, be increased with this clearance angle α 1 that hour compares, this clearance angle α 1 that compares when low when the hardness of machined object is high is increased.In step S4, at above-mentioned flex point angle θ, to move back the amount of cutting R, become the above-mentioned mode that the amount of cutting Rc and clearance angle α become above-mentioned clearance angle α 1 of moving back, determine the conic section in fine finishining plastic deformation interval.
And the protuberance 18 of the shape of setting as described above, can, by for example changing with its diameter dimension the cam that (moving back the variation of the amount of cutting R) makes accordingly, make to grind skiving stone and mechanically relatively approach discretely and form with respect to screw tap material.The groove that slot part is generally carried out respectively in the processing of external screw thread 16 grinds the periphery of cutting processing and crest and grinds and cut processing, and in the present embodiment, by groove, grind and cut the side that forms of processing and by periphery, grind to cut and process the crest forming, all to become the above-mentioned mode of cutting shape of moving back, form.
In such thread forming tap 10, about the shape in screw forming process side from protuberance 18 summit, surplus interval is roughly 0, and therefore, the contact area that adds the machined object in man-hour with screw forming diminishes, and friction torque, heating reduce.In addition, near processing relevant protuberance 18 summit to screw forming, be provided with the interval and thick plastic deformation of fine finishining plastic deformation interval, the thick plastic deformation interval of having left from protuberance summit (δ=0 °), with respect to angle δ, move back the archimedes curve shape that the amount of cutting R changes for the mode with straight line, and in subapical fine finishining plastic deformation interval, the shape of protuberance 18 forms in the mode changing along with conic section, near machining load great summit, the variation of moving back the amount of cutting R diminishes, therefore screw forming processing can successfully be carried out, the durability of not damaging protuberance 18 is (anti-wear, damage etc.) reduce friction torque, heating.
Like this, according to the thread forming tap 10 of the present embodiment, by dwindling and the special shape of protuberance 18 of surplus interval, do not damage protuberance 18 durability (anti-wear, damage etc.) reduce friction torque, heating, for example, even therefore at High-speed machining, low lubricating oils (, do not comprise that chlorine is the water-soluble finish of extreme pressure agent) etc. while easily producing under the condition of welding screw forming machining internal thread, also can suppress generation, the wearing and tearing of protuberance 18, the damage of welding, and improve life tools.In addition, be not limited to the low-carbon steel that ductility is good, also can be applicable to the materials such as harder high carbon steel, steel alloy (more than 30HRC left and right) of thread forming tap processing difficulties.
In addition, in the present embodiment, flex point angle θ is defined in the scope of 0 ° of < θ≤4 °, clearance angle α 1 is defined in the scope of 1≤12 ° of 2 °≤α, on the other hand, in fine finishining plastic deformation interval along with towards flex point angle θ, it is large that clearance angle α becomes gradually, near this flex point angle θ, becoming clearance angle α 1 ground is connected smoothly with thick plastic deformation interval, therefore, screw forming processing becomes and further successfully carries out, the durability that can not damage protuberance 18 is (anti-wear, damage etc.) suitably reduce friction torque, heating.
In addition, in the present embodiment, protuberance 18 clips summit and forms symmetric shape (δ=0 °), therefore as a whole, surplus interval is roughly 0, and diminish and suitably reduce friction torque, heating with the contact area of machined object, and, compare with the situation of setting separately the shape of withdrawing side with respect to process side, design easy, simple and cheap.
Along band explanation, as shown in Figure 4 (a), respectively prepare respectively 2 with protuberance 18 summit near product variform of the present invention, product and comparative product in the past, with processing conditions below, carry out the tapping of internal thread process and checked durability (processing hole count), obtain result as shown in Figure 4 (b).The surplus of product of the present invention is identical with the thread forming tap 10 that is roughly above-described embodiment of 0, product had surplus in the scope that amounts to 4 ° of left and right of the both sides of protuberance summit (δ=0 °) in the past, and protuberance shape is determined in the mode similarly changing along with conic section with above-mentioned fine finishining plastic deformation interval in the outside of surplus.The surplus of comparative product is roughly 0, is provided with the interval and thick plastic deformation of above-mentioned fine finishining plastic deformation interval near protuberance 18 summit, but the clearance angle α 1=6 ° in flex point angle θ=6 of the boundary sometimes waiting as them °, thick plastic deformation interval.This comparative product is included in the invention product of recording in technical scheme 1.Fig. 4 (a) has appended the figure of comparative product in above-mentioned Fig. 1 (c).
" processing conditions "
Nominal value: M10 * 1.5
The chrome-molybdenum steel that machined object material: SCM440(JIS limits)
Machined object hardness: 29～31HRC
Underfill aperture: 9.25mm
The bottom outlet degree of depth: 19mm(connects)
Tapping length: 19mm
Cutting speed: 15m/min
Rotating speed: 477min
-1
Feed mechanism: synchronous motor
Lubricating oils: water-soluble (10 times of dilutions)
Oiling mode: outside
In Fig. 4 (b), with respect to life tools of product be in the past the situation in 2 holes, be approximately 1400 holes the life tools of product of the present invention, the Wei560 life tools hole of comparative product.Product and comparative product according to the present invention, improve life tools significantly.Particularly, the product of the present invention of flex point angle θ=2 °, even compare with the comparative product of flex point angle θ=6 °, also can obtain 2 times of above durability.In addition, product of the present invention is by " GP-OUT ", , connect plug thread gauge (GP) not break-through internal thread and reach the life-span, because of wearing and tearing of the protuberance 18 of above-mentioned external screw thread 16 etc., the diameter dimension of internal thread does not reach given size, and comparative product and in the past product can not be processed because of welding, hence one can see that does not just merely arrange fine finishining plastic deformation interval (interval of conic section shape) and thick plastic deformation interval (interval of archimedes curve shape) near protuberance 18 summit, also the flex point angle θ by the boundary as their grades is 4 ° following (trial target θ=2 °), can suitably suppress welding.
Fig. 5 prepares equally respectively 2 products of the present invention, comparative product and product in the past, with processing conditions below, the tapping processing of carrying out internal thread checks durability, and, measuring product of the present invention and in the past during the tapping moment of torsion of product, Fig. 5 (a) represents durability (processing hole count), and Fig. 5 (b) represents the typical example of tapping moment of torsion.The nominal value of trial target is now all M8 * 1.25, and near the shape protuberance 18 summit of product of the present invention and in the past product is identical with above-mentioned Fig. 4 (a).That is, it is interval that product of the present invention has the interval and thick plastic deformation of fine finishining plastic deformation, and, as their flex point angle θ=2 ° of boundary, the clearance angle α 1=6 ° in thick plastic deformation interval.In addition, product had surplus in the scope of 4 ° of left and right of total of the both sides of protuberance summit (δ=0 °) in the past, and similarly, protuberance shape changes along with conic section for the outside of surplus and above-mentioned fine finishining plastic deformation interval.On the other hand, the surplus of comparative product is roughly 0, but it is interval not have the fine finishining plastic deformation that protuberance shape changes in the mode of conic section, directly in both sides, is provided with the thick plastic deformation interval (clearance angle α 1=6 °) of archimedes curve shape from protuberance summit (angle δ=0 °).
" processing conditions "
Nominal value: M8 * 1.25
The chrome-molybdenum steel that machined object material: SCM440(JIS limits)
Machined object hardness: 29～31HRC
Underfill aperture: 7.4mm
The bottom outlet degree of depth: 20mm(connects)
Tapping length: 16mm
Cutting speed: 15m/min
Rotating speed: 600min
-1
Feed mechanism: tapping machine (タ ッ パ ー) (transmitting without synchronous motor)
Lubricating oils: water-soluble (10 times of dilutions)
Oiling mode: outside
In Fig. 5 (a), in the past below the Wei100 life tools hole of product, with respect to life tools of comparative product be 1000 left and right, holes, be more than 6000 holes the life tools of product of the present invention, the product according to the present invention like this, improve life tools significantly.In addition, with respect to the durable gauge reason of product in the past for not processing because of welding, product of the present invention and comparative product be because, " GP-OUT ",, connect plug thread gauge (GP) not break-through internal thread and reach the life-span, because of the wearing and tearing of the protuberance 18 of above-mentioned external screw thread 16 etc., the diameter dimension of internal thread does not reach given size.Although the comparative product directly forming with archimedes curve shape from protuberance summit (angle δ=0 °), diminish with the contact area of machined object, can suitably suppress welding, but, near durability (anti-wear, damage etc.) the particularly summit of infringement protuberance 18, can not obtain sufficient life tools.The fine finishining plastic deformation interval of conic section shape need to be set thus, near protuberance 18 summit.
Fig. 5 (b) mean by product of the present invention and in the past the screw forming of product add the figure that the tapping moment of torsion in man-hour compares, with respect to product of the present invention, be approximately 10Nm, product was approximately 17Nm in the past, the product according to the present invention, compare with product in the past, tapping moment of torsion reduces about 40%.By the reduction of this tapping moment of torsion, can suppress heating, welding, improve durability.
Above, based on accompanying drawing, understand in detail embodiments of the invention, but this also embodiment only, and the knowledge that the present invention can be based on one of ordinary skill in the art, implements to make the mode of various changes, improvement.
Claims (5)
1. a thread forming tap, it has complete tooth portion and arranges continuously with this complete tooth portion and the forward end cutting portion of path more more, and, in these complete tooth portions and cutting portion, be provided with the external screw thread that has alternately formed protuberance and withdrawing portion, it is characterized in that,
The shape around tool focus line O about the above-mentioned protuberance of above-mentioned cutting portion, screw forming process side in the vertex of this protuberance from diameter dimension maximum, and carry out in the machining area of screw forming processing being cut into machined object, above-mentioned summit is made as to 0 °, the angle towards screw forming process side around above-mentioned tool focus line O is made as to δ, now
At above-mentioned angle δ, be that fine finishining plastic deformation below flex point angle θ predetermined in above-mentioned machining area is interval, as the amount of retreating of the diameter dimension on the above-mentioned summit from this angle δ=0 °, move back the amount of cutting R, be confirmed as with along with towards this flex point angle θ side the mode that increases, the shape of above-mentioned protuberance with respect to this angle δ along with conic section changes, on the other hand
Interval in the thick plastic deformation that above-mentioned angle δ is larger than above-mentioned flex point angle θ, be confirmed as moving back with above-mentioned the mode that the amount of cutting R increases point-blank with respect to this angle δ, the shape of above-mentioned protuberance is along with the archimedes curve of the clearance angle α 1 in certain thick plastic deformation interval changes
And the surplus interval of the diameter dimension of the described protuberance equating with the diameter dimension on above-mentioned summit is set as and is roughly 0, or above-mentioned angle δ is in 1 ° of following scope.
2. thread forming tap according to claim 1, it is characterized in that, above-mentioned fine finishining plastic deformation is interval, if there is no above-mentioned surplus, be in above-mentioned angle δ=0 ° from above-mentioned summit to the scope of above-mentioned flex point angle θ, in the situation that there is above-mentioned surplus, be in from the outer end of this surplus to the scope of this flex point angle θ.
3. thread forming tap according to claim 1 and 2, it is characterized in that, above-mentioned flex point angle θ is defined in 0 ° of < θ≤4 °, and when there is above-mentioned surplus, above-mentioned flex point angle θ is defined in the scope in outside of this surplus
The clearance angle α 1 in above-mentioned thick plastic deformation interval is defined in the scope of 1≤12 ° of 2 °≤α,
Interval in above-mentioned fine finishining plastic deformation, along with towards above-mentioned flex point angle θ, clearance angle α becomes greatly gradually, and near this flex point angle θ, clearance angle α 1 ground that becomes above-mentioned thick plastic deformation interval is connected smoothly with above-mentioned thick plastic deformation interval.
4. thread forming tap according to claim 1 and 2, is characterized in that, clips the shape of the withdrawing side contrary with above-mentioned screw forming process side on the above-mentioned summit of above-mentioned angle δ=0 °, changes relatively symmetrically with this screw forming process side.
5. thread forming tap according to claim 1 and 2, it is characterized in that, the shape with the above-mentioned protuberance in the interval and above-mentioned thick plastic deformation interval of above-mentioned fine finishining plastic deformation is, the shape at the above-mentioned externally threaded side of this protuberance and the position of the either one or both in crest.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2009/062360 WO2011004455A1 (en) | 2009-07-07 | 2009-07-07 | Thread forming tap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102470467A CN102470467A (en) | 2012-05-23 |
| CN102470467B true CN102470467B (en) | 2014-01-15 |
Family
ID=43428895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980160317.9A Active CN102470467B (en) | 2009-07-07 | 2009-07-07 | Thread Forming Taps |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8998734B2 (en) |
| JP (1) | JP5456042B2 (en) |
| CN (1) | CN102470467B (en) |
| DE (1) | DE112009005043B4 (en) |
| WO (1) | WO2011004455A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2985445B1 (en) * | 2012-01-05 | 2014-09-26 | Snecma | TOOL FOR THE MACHINING OF A WALL OF A WORKPIECE, IN PARTICULAR IN COMPOSITE MATERIAL. |
| FR2997326B1 (en) | 2012-10-30 | 2015-04-17 | Skf Ab | METHOD OF MANUFACTURING THE THREADING OF A NUT NUT AND TAPPER NUT SYSTEM BY DEFORMATION THEREFOR |
| DE102016122701B4 (en) | 2016-11-24 | 2023-10-26 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Thread former and method for producing a thread former |
| DE102019130009A1 (en) * | 2019-11-07 | 2021-05-12 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Tool for non-cutting production or post-processing of a thread, method for producing the tool and method for producing a thread |
| CN115066306B (en) * | 2020-01-21 | 2024-12-06 | Osg株式会社 | Extrusion tap |
| CN114054871A (en) * | 2021-12-04 | 2022-02-18 | 陕西渭河工模具有限公司 | High-precision multi-edge high-speed extrusion screw tap and heat treatment process |
| JP2023132849A (en) * | 2022-03-11 | 2023-09-22 | 株式会社彌満和製作所 | excitement tap |
| JP2023172656A (en) * | 2022-05-24 | 2023-12-06 | 株式会社彌満和製作所 | Surface-coated tool, particularly, surface-coated cold forming tap, and method for manufacturing the same |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6217267B1 (en) * | 1997-07-16 | 2001-04-17 | Osg Corporation | Cold forming tap having internal finish cutting edge and method of producing the same |
| US6685573B2 (en) * | 2001-10-22 | 2004-02-03 | Osg Corporation | Thread forming tap |
| JP2004148430A (en) * | 2002-10-30 | 2004-05-27 | Yamawa Seiki Kogyo Kk | Cold forming tap with improved strength |
| JP2004276085A (en) * | 2003-03-18 | 2004-10-07 | Yamawa Seiki Kogyo Kk | Torque reductive cold forming tap |
| JP2006239858A (en) * | 2005-03-01 | 2006-09-14 | Emuge-Werk Richard Glimpel Gmbh & Co Kg | Tool and method for forming screw thread |
| CN101247916A (en) * | 2005-04-27 | 2008-08-20 | Osg株式会社 | Thread forming tap and manufacturing method thereof |
| CN101400469A (en) * | 2007-04-26 | 2009-04-01 | Osg株式会社 | Spiral tap |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2991491A (en) * | 1958-11-21 | 1961-07-11 | Besly Welles Corp | Fluteless swaging tap with sizing area increasing at a constant rate |
| US3390410A (en) * | 1966-05-06 | 1968-07-02 | Detroit Tap & Tool Company | Thread swaging tap |
| DE3522977A1 (en) | 1985-06-27 | 1987-01-08 | Buderus Ag | METHOD FOR PROFILE PROFILING OF A WORKPIECE |
| SE505742C2 (en) * | 1993-09-07 | 1997-10-06 | Sandvik Ab | Threaded taps |
| US7144208B2 (en) * | 2004-06-07 | 2006-12-05 | Kennametal Inc. | Low torque tap |
| US7927221B2 (en) * | 2006-03-14 | 2011-04-19 | Emuge-Werk Richard Glimpel Gmbh & Co. | Tool and method for the production of a thread |
| US9033624B2 (en) * | 2007-12-12 | 2015-05-19 | EMUGE-Werk Richard Glimpel GmbH & Co. KG, Fabrik für Präzisionswerkzeuge | Screw tap and method for the production of a screw tap |
-
2009
- 2009-07-07 JP JP2011521725A patent/JP5456042B2/en active Active
- 2009-07-07 DE DE112009005043.3T patent/DE112009005043B4/en active Active
- 2009-07-07 US US13/379,535 patent/US8998734B2/en active Active
- 2009-07-07 WO PCT/JP2009/062360 patent/WO2011004455A1/en active Application Filing
- 2009-07-07 CN CN200980160317.9A patent/CN102470467B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6217267B1 (en) * | 1997-07-16 | 2001-04-17 | Osg Corporation | Cold forming tap having internal finish cutting edge and method of producing the same |
| US6685573B2 (en) * | 2001-10-22 | 2004-02-03 | Osg Corporation | Thread forming tap |
| JP2004148430A (en) * | 2002-10-30 | 2004-05-27 | Yamawa Seiki Kogyo Kk | Cold forming tap with improved strength |
| JP2004276085A (en) * | 2003-03-18 | 2004-10-07 | Yamawa Seiki Kogyo Kk | Torque reductive cold forming tap |
| JP2006239858A (en) * | 2005-03-01 | 2006-09-14 | Emuge-Werk Richard Glimpel Gmbh & Co Kg | Tool and method for forming screw thread |
| CN101247916A (en) * | 2005-04-27 | 2008-08-20 | Osg株式会社 | Thread forming tap and manufacturing method thereof |
| CN101400469A (en) * | 2007-04-26 | 2009-04-01 | Osg株式会社 | Spiral tap |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120107063A1 (en) | 2012-05-03 |
| JP5456042B2 (en) | 2014-03-26 |
| DE112009005043B4 (en) | 2021-12-30 |
| CN102470467A (en) | 2012-05-23 |
| DE112009005043T5 (en) | 2012-06-06 |
| US8998734B2 (en) | 2015-04-07 |
| WO2011004455A1 (en) | 2011-01-13 |
| JPWO2011004455A1 (en) | 2012-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102470467B (en) | Thread Forming Taps | |
| US6923602B2 (en) | Drill having construction for reducing thrust load in drilling operation, and method of manufacturing the drill | |
| US9033624B2 (en) | Screw tap and method for the production of a screw tap | |
| US7950880B2 (en) | Spiral flute tap | |
| JP6266603B2 (en) | Method and tool for forming threads on a workpiece | |
| EP2774704B1 (en) | Drill | |
| US7367754B1 (en) | Variable helix rotary cutting tool | |
| US20040105730A1 (en) | Rotary cutting tool having main body partially coated with hard coating | |
| US7665934B2 (en) | Cutting tap and method of making a cutting tap | |
| EP2184125B1 (en) | Ball end mill | |
| WO2010137429A1 (en) | Carbide end mill and cutting method using the end mill | |
| WO2009116178A1 (en) | Thread forming tap | |
| CN103302364B (en) | Chip-resistant cutting tap | |
| KR20050089967A (en) | Rotary metal cutting tool | |
| US20150104265A1 (en) | 3-blade drill | |
| US20180133824A1 (en) | Threading tools with fluid ducts | |
| US20060039767A1 (en) | Carbide drill capable of drilling hole with reduced degree of work hardening | |
| EP3403753B1 (en) | Screw thread cutter | |
| CN108971671B (en) | Spiral fluted tap with continuously increasing helix angle | |
| JP2006239858A (en) | Tool and method for forming screw thread | |
| JP7018136B2 (en) | Excitement tap | |
| JP7138927B2 (en) | Drill | |
| WO2024004890A1 (en) | Thread forming tap | |
| WO2025032813A1 (en) | Thread-forming tap | |
| JP2011161579A (en) | Cutting tap |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |